I efiled, and mailed 8453 form. it seems I filed an incomplete 8453 for one broker, how do I correct that?

All they really want is 1099 B from the broker  that shows your trades results, attach the broker statement to form 8453 and mail to the address at the lower right side of 8453.

 attach your broker statement to form 8453 and mail to the Austin TX address , located at the lower right side of form 8453.